In a complaint filed Thursday in the U.S. District Court for the District of Delaware, South Korean LG and its United States subsidiary, LG Electronics U.S.A. Inc., allege that a number of Whirlpool refrigerator models, including some sold under the Maytag, Amana, Jenn-Air and KitchenAid brand names, infringe three LG patents.

The patents asserted by LG cover fridge features like the ice and water...